a a ee ee ee Pee er he ye ey Cer ae ee ee 
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1896 } ROSE AMERICANAE 5 
ment occurring upon a single bush, however, which deserves 
special study. 
In the section CINNAMOME# the armature of the axes shows 
three conditions: (1) all the axes may be covered with setaceous 
prickles, scattered and more or less abundant; (2) scattered 
prickles may occur only in the lower parts of the axes, being 
completely wanting in the upper parts, which thus become 
unarmed; (3) prickles may be borne, as before, upon the lower 
parts and disappear in the upper parts, where the armature is 
reduced to the regularly paired prickles upon each leaf. It may 
happen that in species normally provided with paired prickles, 
these may not be produced upon certain floriferous branches, 
as also at the extremity of the stems. 
In the first case, in which the axes are completely setigerous, 
dwarfing has apparently no influence upon the armature; but 
enlarging produces a diminution in the number of prickles at the 
extremity of the axes. In the second — nace oe produces 
the appearance of kl t qually over all the 
axes; while enlarging increases the unarmed appearance. Lastly, 
in the third case, dwarfing produces the development of numer- 
ous prickles equally distributed upon those parts of the axes 
which are normally without them and introduces an obstacle to 
the regular arrangement of the paired prickles; while enlarging 
favors the occurrence of paired prickles upon the extremity of 
the axis. 
These variations in the armature result in specimens of the 
same species differing much from one another, according as they 
have been taken from the dwarf or giant bushes, or from the 
lower or upper parts of the same bush. 
Again, dwarfing may produce the curious result of trans- 
forming the main stem into flower-bearing branches. These 
stems, remaining dwarf, instead of terminating in a leaf bud 
which continues the axis, end in an inflorescence which is more 
or less many-flowered. These stems are thus transformed into 
floriferous branches, differing in appearance from the normal 
floriferous branches, and showing one or two more pairs of leaf- 
